. terror at the boston marathon. the death toll has risen to three, more than 130 have been injured, a pair of bombs went off as runners crossed the

finish line. >> police comb the streets for clues, no suspect in custody, no motive. they are trying to identify who is responsible. >> president obama, echoing the calls to bring the attacker to justice. as the nation mourns those who lost their lives. we begin with catie davis on boylston street. >> reporter: two explosives detonate near the finish line of the boston marathon. >> it was really loud and chaos everywhere. >> the the devices 12 seconds apard. >> 50 to 100 yards apart. each scene resulted in multiple casualties. >> it was a holiday in this

city, when the marathon is run. the governor told the citizens to remain calm. >> two explosionos boylston street. >> there were victims who had lost limbs, and tonight, it is was announced the fbi is taking the lead in the investigation. >> it has the potential terrorist investigation. >> president obama vowed to bring those responsible to justice. >> we will find out who did this and hold them accountable. >> multiple explosive devices were found at the scene. boston now dealing with a mass casualty, as a shaken city tries to come to gribs with a violent attack in the heart of the city. katie davis, nbc news, boston.

police officers are searching for evidence. here are people who called in to us to report what they saw. >> we saw smoke, people running hysterically. knocking over the barricades to get off the way. >> you don't know what to do but to ex're get out of there. >> a lot of people on the streets crying. there were a lot of people that obviously saw it. there were a lot of people that didn't, and had no idea what was happening. >> a former army medic said he was inside a building near, and the force of the explosion knocked him to the floor. he got to work treating people until paramedics arrived. >> today's tragedy hit hard, a team from newtown wanted to

honor victims of the sandy hook shooting. the runners dedicated each of the 26 miles to the 26 victims. there was a moment of silence, and the newtown seal was placed at the 26 mile mark. all of the runners representing newtown were not injuried in the explosions. >> we are hearing the audio calls. jim henley has more on the chaos and the confusion from the scene today. >> dozens of victims, bags abandoned in that chaos. blocked roadways and of course, the huge crowds. posted online, can you hear the tense moments after the explosions, as first respenders

tried to get all units to the scene around the finish line. >> i want one road cleared, ambulances in and out. i need lanes open here. >> boylston, we need to set up a perimeter. get people away. >> get everybody out there. use kagz, there may be additional devices. use caution. >> i need someone on social media, let people know. we are sweeping the street to make sure it is safe. get them out once it is swept. we have all the victims off the scene. >> we are finishing the evacuation of the surrounding buildings. >> the last call, referring to an explosive sweep that lasted hours this evening n midst of everything, you hear for a call at the jfk library, that turned out to be an unrelated fire.

many in the marathon crowd that tried to call out on their cell phones couldn't, because the system was overloaded. much like the trouble we had on 9/11. >> a eventual tribute, house speaker has ordered the flags to fly at half staff out of respect for the victims in boston. security is stepped up at the white house, including airports and metro stations, there is no incredible threat, there is a precaution here and across the u.s. cities tonight. more on what is being done to keep you safe, jackie? >> well, we can tell you that every law enforcement agency is on high alert tonight. >> reporter: the most visible is near the white house, and

lafayette square. within moments, of the explosion says at the boston marathon. they quickly evacuated the plaza in front of the white house. >> they ordered everybody, and frantically running up and down with the tape. i asked if it had going do with the explosions at the boston marathon. >> reporter: with the motive >> we have enhanced security around the city. we would vthat with an incident national lee internationally, until we have confirmation there is no threat to washington, d.c. >> we hope that people will continue to come down and engin

we plan to go f,d as we planned prior readyc forvtv in boston. metro, keeping officers on overtime. the transit agency is advising described it more like bombay than ybo in boston from reaction from local sjí"o the blast. >> reporter: tonight, many of those peoplew:1'0í+ vide rig thoseb] %y00@39pnd, two dozen'k runner

outi0r ciybble >> you came up from here springfield, virginia, this explosion happens, what is happening in your mind? >> initially, i said, this can't be a bomb. i was former navy officer, i have seen something like that -- 15 seconds later, when the second bomb went off, we knew it was for real. >> reporter: tonight, people we talked to tell me they may not be in physical parngs but in

emotional pain, in a night they are supposed to be celebrating, crossing the finish line. they plan on leaving hotels soon and flying back home. many are concerned, and they keep telling me, they want to know who is responsible and why did it have to happen. >> so many have taken to social media in wake of the tragedy. >> hash tag pray for boston, one tweet is getting a lot of attention as well. nbc sports network reported runners who crossed the finish line and continued to run to the hospital to donate blood. >> today's boston marathon had nearly 30,000 athletes from over 90 country, but tonight we are all bostonians.

>> we will have updates throughout this newscast, and for the latest information any time of day, head to our website, nbc washington.com. >> we turn to the weather. cooler temperatures, a warm up is in store. cameras are tracking the changes. >> the clouds did keep things on the cooler side. highs in the 60s. out there today, a high of 63 in washington, our average high this time of year is up to 67. look at anap police, and back toward the west, 64. leesburg, the high spot today. and light showers and sprinkles, through cullpepper, don't be surprised to see sprinkles on your windshield overnight and early tomorrow. you may need the umbrella early, but not during the day tomorrow. we will be warming up over the next few days, the rest of the

week as a matter of fact. i think we will get into the 70s tomorrow. not just the 70s by wednesday, 80 by friday, don't think this is an all good forecast. we will show you what will come with the warmer temperatures coming up. up next, our coverage of the terror in boston continues. a look at what may be the youngest victim in the attack. and the major changes in effect starting tomorrow in boston. >> reporter: around the corner from the finish line, unable to make it across because of the explosions, the heart warms story of how one runner gave another man his medal. >> it was like a sound i had never heard before it. shook you to the core. then, you try to figure out what happened. saw the smoke. the second explosion occurred. at that point, it was pandemonium. >> it was a huge explosion, and

debris everywhere. >> i got within a block. then, i saw an explosion

investigators are combing the area, after a bomb went off at the finish line of the boston marathon. one of those killed, an 8-year-old boy. the fbi is taking the lead on the investigation, still, no suspects or motive. the governor patrick said boston will be open for business trnlgs but it won't be business as usual. there will be random bag checks on mass transit, and some

streets will remain closed. >> the last flight arrived into regan international airport. passengers got off the plane sharing their tragedies, and unity in the wake of the bombing. >> local runners who returned home, tonight. eric a. >> whether they were able to finish the race or not, some of the stories we have been able to hear are truly humanity as its finest. >> i was disappointed i couldn't finish the race. >> it was his first time to finish the boston marathon. these are the images he will remember. with the finish line in sight, he was forced to stop running. >> 25 and a half. we heard there were potentially bombs that went off. he was explaining the turn of events to a runner that finished. there on a crowded flight, grace and a guy on the plane gave me his extra medal. >> it was awesome.

most people didn't get medals because they didn't get to the finish line. >> this man, who asked we not show his face, did make it across. >> i was at the finish line, which is about, maybe a hundred feet. >> hujust crossed. >> i just finished. >> there before the weary runner, plumes of smoke. >> you are look at the dust and the debris off the knowledges into the street, you can see the second explosion down the street. >> he tells me it felt it was obvious what was happening, this date, that race, those athletes and spectators, tainted by terror. >> another 30 seconds, how easy it is to shift 20, 30 seconds, another 30 seconds slower, i would have been in front of where the explosion went off. >> a lot to think about for the runners as they come home tonight. yet, we are expecting another

wave of runners to come home tomorrow. live at regan national airport, eric gonzalez, news 4. >> people try to figure out if their loved ones are safe. google is trying to help those. log on to google.com/person finder, can you search someone's name or someone you have information b the site is currently tracking 5,000 records. >> technology at its finest. >> many texting, you could find out they were okay via text. >> the phones were jammed up. >> cooler weather around here for us today. >> yes, actually, well over a week today. i do think we will be warming up over the next couple of days, in the 70s, near 80. like i said a minute ago, it is not going to come without something else making its way our way first. take a look outside, you can see

what is happening, toward the airport. a nice, mild night. plenty of cloufr across the region, toward the capital. clear skies at the surface. no fog out there. it may be the case during the morning tomorrow, in some locations, heads up for light fog, near washington, d.c. a low of 57, average high 67, today, the first day below average in some time. the coolest day in more than a week. temperatures in 70s, 80s, and 91 last wednesday. right now, fifty-nine degrees. we continue to see the cloud cover, and i think the cloud cover is going to stay in here for the rest of the night tonight.5m;5ivck is not going -w temperatures to cool. 57/#faúu pax river, we are

going to see shower activity continuing, these are light sprinkles, in through cullpepper county, and will continue. don't be surprised, overnight, into tomorrow morning, to see sprinkles, you may need the purse umbrella. not expecting heavy showers until later this week. we will continue to see clouds through much of the morning tomorrow and through much of the day tomorrow, too. i do expect to see at least some sunshine mixed n cloudy skies and mild conditions will be here for the morning. tomorrow afternoon, look at the clears in the afternoon. i think we will see some sunshine, that will help temperatures to get in the low 70s, as will a sournl wind. like last week, a front comes down across the area, will e to the south of the d.c.? it will be cooler, we will stay

on the mild side of this. shower activity wednesday is and thursday, most of the day on the 2kr50i side. going optimistic with the forecast. xv#,94fz another cold f 4 not mild.l a chance of a shower on thursday, with a high of 76, on friday, a high of 80. we will see another cold front come through. that could bring in not only thunderstorms, but be aba that rain with storms line tha could be strong, there will be a potential for a severe outbreak

in the middle part of the country, i don't think that will translatey i the grief was staggering. one hundred days after us senate starts to act are coming together background checks the second amendment hands of dangerous criminals. ninety percent of america background checks. urge them to join comprehensive background checks. demand action. now.

&)bc marl>xke00 night getting>1qkes swept@ atm⌜c nats. >> the old miami marlins have turned into the slump busters. after getting swept at home,

jordan zimmerman with. game.y2

time. told me, just, you know, it is for you to pick your decision. they said they are happy either way. ñning v l09$naj%d0 s1 taylor misses, that is former wizard he helped to beat his old team, 106-101 was the final. team, 106-101 was the final. the did we get it?

got it. yes!

contact the verizon center for customers with disabilities at 800-974-6006 tty/v. how do i make it stronger? [ male announcer ] when you've got fios quantum, you get america's fastest, most reliable internet. hey, so where's the big project? ...huh. [ male announcer ] technology that makes you feel superhuman... where do i sign in? that's powerful. switch to fios and we'll triple your speeds for free with an upgrade to fios quantum. marvel's iron man 3, in theaters may 3rd.

$pn00tmt feel58wi0ab ,á litheuania, she is raising three cougar cubs, the zoom let her take them temporarily, after the mother started to reject them.ó wi 4 is a good mi

♪ ♪

[ multiple sounds making melodic tune ] ♪ [ male announcer ] at northrop grumman, every innovation, every solution, comes together for a single purpose -- to make the world a safer place. that's the value of performance. northrop grumman.

>> announcer: it's "the tonight show with jay leno," featuring rickey minor and "the tonight show" band. tonight, jay welcomes -- jerry seinfeld, dallas mavericks owner mark cuban, the music of jose james, and "fun with fake surveys." and now, jay leno!